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FICO

Principal Harness Engineer

FICO

. Design, build, deploy, and support core harness components, including guides, feedback loops, guardrails, and shared context .

Posted 10/27/2026full-timeRemote • United KingdomLeadWebsite

Core Competencies

Role fit
Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in software architecture, design, and development, with a strong focus on AI coding agents and engineering tooling. Capable of establishing quality standards, driving team-wide standardization, and mentoring engineers in harness practices.

Highest-signal resume keywords
AI Coding Agents ExperienceSoftware Architecture ExpertiseQuality-Gating Processes OwnershipEngineering Tooling DevelopmentConsumer/Contract Testing Knowledge

ATS Keywords

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Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills
Software ArchitectureAI Coding AgentsStatic AnalysisCI/CD PipelinesContext EngineeringAgent OrchestrationQuality Standards EncodingDeterministic Controls JudgementRelease Criteria DefinitionAutonomous-Agent Security
Soft Skills
Excellent Communication Skills
Tools & Technologies
LintersContainerised Build/Test EnvironmentsInstrumentationObservability ToolsPact
Certifications & Qualifications
Bachelor's in Computer ScienceMaster's in Computer Science
Industry Keywords
AI-Agent Outputs StandardizationFeedback SensorsQuality GatingEscalation RulesObservability Measures

About the role

Key responsibilities & impact
  • Design, build, deploy, and support core harness components, including guides, feedback loops, guardrails, and shared context
  • Own and evolve feedforward guides, agent instruction files, reusable skills, architectural rules, reference documents, and codemods
  • Drive team-wide standardisation for AI-agent outputs
  • Build feedback sensors such as custom linters, static analysis, architecture-fitness tests, verification loops, and LLM-as-judge reviewers
  • Own quality gating and release criteria for agent-produced work
  • Define authority boundaries for unaided agent merges and escalation rules for human review
  • Establish LLM testing infrastructure and evaluation approaches for AI-generated output
  • Apply consumer/contract testing where service integration reliability matters
  • Run the steering loop to prevent repeated agent mistakes and maintain repository knowledge
  • Decide where controls run across the path to production
  • Improve observability into agent work and track measures such as cost per merged PR, time-to-merge, review velocity, defect escape rate, and agent-PR survival rate
  • Partner with product and platform teams to turn specifications and acceptance criteria into enforceable controls
  • Serve as a technical expert and mentor engineers in harness practices and responsible AI-tool use

Requirements

What you’ll need
  • Bachelor's/Master's in Computer Science or related disciplines, or relevant commercial experience in software architecture, design, development, and testing
  • Experience as a seasoned software engineer with large, complex codebases
  • Strong foundation in architecture and design
  • Hands-on experience with AI coding agents such as Claude Code, Codex, or similar
  • Experience building engineering tooling across a modern stack, including linters, static analysis, CI/CD pipelines, containerised build/test environments, and instrumentation/observability
  • Familiarity with agent instruction conventions such as AGENTS.md
  • Experience with spec-driven development, context engineering, agent orchestration, fitness functions, and developer-platform work
  • Ability to encode quality standards into mechanical, repeatable rules
  • Judgement regarding deterministic computational controls versus inferential LLM-based controls, including cost, speed, and reliability trade-offs
  • Experience owning quality-gating processes and defining release criteria
  • Working knowledge of autonomous-agent security, including prompt injection, tool/permission scoping, sandboxed execution, and audit trails
  • Experience with consumer/contract testing approaches such as Pact
  • Excellent communication skills and ability to articulate designs with architects and drive standards across teams

Benefits

Comp & perks
  • Highly competitive compensation, benefits and rewards programs
  • Work/life balance
  • Employee resource groups
  • Social events
  • Valuable learning experiences
  • Professional development opportunities
  • Inclusive, people-first work environment